Haptic Display Glass Motion for Low-Volume Dashboard Integration
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Solution Overview
Problem
Existing vehicle dashboard display devices face challenges in providing effective haptic feedback due to limited volume for integrating mechanical actuators, which require a minimum displacement and acceleration to be perceived by the user.
Innovation Solution
A display device design that includes a façade glass, a backlighting device, a modulator, and at least one mechanical actuator, where the actuator displaces only a portion of the display device relative to the backlighting device, reducing the mass to be vibrated and allowing for smaller or fewer actuators to achieve the necessary haptic feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple mechanical actuators or large mechanical actuators are used to provide haptic feedback, then the minimum displacement and acceleration constraints are satisfied, but the volume required for actuator integration increases
Solution Approach 1:
The display device is segmented into movable and stationary portions. The façade glass and modulator are made movable relative to the backlighting device, allowing the actuator to only displace the necessary display components rather than the entire assembly. This segmentation enables effective haptic feedback with smaller actuators that fit within limited dashboard volume.
2Reliability
If the entire display device is displaced to provide haptic feedback, then the haptic feedback is effective, but the mass to be vibrated increases requiring larger actuators
Solution Approach 1:
The display device is divided into a movable portion (façade glass and modulator) and a stationary portion (backlighting device). The mechanical actuator is configured to displace only the movable portion, significantly reducing the mass that needs to be vibrated compared to displacing the entire display device. This segmentation maintains effective haptic feedback while reducing actuator size and power requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enables the integration of haptic feedback touchscreens in narrow spaces while maintaining effective haptic performance, allowing for smaller actuators and reduced manufacturing costs.
Implementation Method 1
said mechanical actuator is a piezoelectric actuator
Implementation Method 2
said modulator is adhesively bonded to said façade glass by an optical adhesive
Implementation Method 3
at least one spring which is in contact with said backlighting device by way of a first end and with said second connection element by way of a second end so as to prestress said mechanical actuator and/or to bring said façade glass to a position of equilibrium
Data Source
AI summary
The invention relates to a display device (1) comprising: —a cover glass (10); —a back-lighting device (20), which is designed to generate a source light beam; —a modulator (12), which is securely fastened to the cover glass and located between said cover glass and the back-lighting device so as to receive the source light beam and to transmit a modulated light beam through the cover glass; and —at least one mechanical actuator (30); according to the invention, said mechanical actuator is placed so as to be able to move the cover glass with respect to the back-lighting device.